Note 4 - Allowance for Loan Losses (Detail) - Loans by credit quality indicators (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Financing Receivables by Credit Quality Indicators	$ 394,342	$ 398,004
Construction Lending (Member) | Pass [Member] | Real Estate Construction [Member]
Financing Receivables by Credit Quality Indicators	561	228
Construction Lending (Member) | Substandard [Member] | Real Estate Construction [Member]
Financing Receivables by Credit Quality Indicators	2,929	2,929
Construction Lending (Member) | Real Estate Construction [Member]
Financing Receivables by Credit Quality Indicators	3,490	3,157
Consumer Lot Lending [Member] | Pass [Member] | Real Estate Construction [Member]
Financing Receivables by Credit Quality Indicators	683	1,905
Consumer Lot Lending [Member] | Real Estate Construction [Member]
Financing Receivables by Credit Quality Indicators	683	1,905
Commercial real estate lending [Member] | Pass [Member] | commercial, financial and agricultural (Member)
Financing Receivables by Credit Quality Indicators	111,453	102,472
Commercial real estate lending [Member] | Special Mention [Member] | commercial, financial and agricultural (Member)
Financing Receivables by Credit Quality Indicators	1,586	2,776
Commercial real estate lending [Member] | Substandard [Member] | commercial, financial and agricultural (Member)
Financing Receivables by Credit Quality Indicators	8,206	10,973
Commercial real estate lending [Member] | Substandard Nonaccural (Member) | commercial, financial and agricultural (Member)
Financing Receivables by Credit Quality Indicators	3,349	3,426
Commercial real estate lending [Member] | commercial, financial and agricultural (Member)
Financing Receivables by Credit Quality Indicators	124,594	119,647
Land acquisition and development lending [Member] | Pass [Member] | commercial, financial and agricultural (Member)
Financing Receivables by Credit Quality Indicators	18,851	19,422
Land acquisition and development lending [Member] | Special Mention [Member] | commercial, financial and agricultural (Member)
Financing Receivables by Credit Quality Indicators	1,765	1,789
Land acquisition and development lending [Member] | Substandard [Member] | commercial, financial and agricultural (Member)
Financing Receivables by Credit Quality Indicators	7,592	7,692
Land acquisition and development lending [Member] | Substandard Nonaccural (Member) | commercial, financial and agricultural (Member)
Financing Receivables by Credit Quality Indicators		5,234
Land acquisition and development lending [Member] | commercial, financial and agricultural (Member)
Financing Receivables by Credit Quality Indicators	28,208	34,137
Builder Line Lending [Member] | Pass [Member] | commercial, financial and agricultural (Member)
Financing Receivables by Credit Quality Indicators	11,563	13,469
Builder Line Lending [Member] | Special Mention [Member] | commercial, financial and agricultural (Member)
Financing Receivables by Credit Quality Indicators	1,774	1,926
Builder Line Lending [Member] | Substandard [Member] | commercial, financial and agricultural (Member)
Financing Receivables by Credit Quality Indicators	538	538
Builder Line Lending [Member] | Substandard Nonaccural (Member) | commercial, financial and agricultural (Member)
Financing Receivables by Credit Quality Indicators	15	15
Builder Line Lending [Member] | commercial, financial and agricultural (Member)
Financing Receivables by Credit Quality Indicators	13,890	15,948
Commercial Business Lending [Member] | Pass [Member] | commercial, financial and agricultural (Member)
Financing Receivables by Credit Quality Indicators	30,460	32,330
Commercial Business Lending [Member] | Special Mention [Member] | commercial, financial and agricultural (Member)
Financing Receivables by Credit Quality Indicators	228	187
Commercial Business Lending [Member] | Substandard [Member] | commercial, financial and agricultural (Member)
Financing Receivables by Credit Quality Indicators	2,140	2,044
Commercial Business Lending [Member] | Substandard Nonaccural (Member) | commercial, financial and agricultural (Member)
Financing Receivables by Credit Quality Indicators	760	759
Commercial Business Lending [Member] | commercial, financial and agricultural (Member)
Financing Receivables by Credit Quality Indicators	33,588	35,320
Pass [Member] | Real Estate - Residential Mortgage (Member)
Financing Receivables by Credit Quality Indicators	146,665	143,947
Pass [Member] | Equity Lines (Member)
Financing Receivables by Credit Quality Indicators	30,759	31,199
Pass [Member] | consumer (Member)
Financing Receivables by Credit Quality Indicators	4,570	4,746
Pass [Member]
Financing Receivables by Credit Quality Indicators	355,565	349,718
Special Mention [Member] | Real Estate - Residential Mortgage (Member)
Financing Receivables by Credit Quality Indicators	871	1,374
Special Mention [Member] | Equity Lines (Member)
Financing Receivables by Credit Quality Indicators	1,248	1,327
Special Mention [Member] | consumer (Member)
Financing Receivables by Credit Quality Indicators	3	3
Special Mention [Member]
Financing Receivables by Credit Quality Indicators	7,475	9,382
Substandard [Member] | Real Estate - Residential Mortgage (Member)
Financing Receivables by Credit Quality Indicators	2,408	2,131
Substandard [Member] | Equity Lines (Member)
Financing Receivables by Credit Quality Indicators	767	767
Substandard [Member] | consumer (Member)
Financing Receivables by Credit Quality Indicators	368	369
Substandard [Member]
Financing Receivables by Credit Quality Indicators	24,948	27,443
Substandard Nonaccural (Member) | Real Estate - Residential Mortgage (Member)
Financing Receivables by Credit Quality Indicators	1,964	1,805
Substandard Nonaccural (Member) | Equity Lines (Member)
Financing Receivables by Credit Quality Indicators	78	31
Substandard Nonaccural (Member) | consumer (Member)
Financing Receivables by Credit Quality Indicators	188	191
Substandard Nonaccural (Member)
Financing Receivables by Credit Quality Indicators	6,354	11,461
Real Estate - Residential Mortgage (Member)
Financing Receivables by Credit Quality Indicators	151,908	149,257
Equity Lines (Member)
Financing Receivables by Credit Quality Indicators	32,852	33,324
consumer (Member)
Financing Receivables by Credit Quality Indicators	$ 5,129	$ 5,309